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  Introduction: What is THR (Through-Hole Reflow)?   Through-Hole Reflow (THR), sometimes called Pin-in-Paste, is a hybrid PCB mounting technology that combines the mechanical strength of traditional Through-Hole Technology (THT) with the automation benefits of Surface-Mount Technology (SMT). It allows components with through-hole leads—like RJ45 connectors—to be mounted using standard SMT reflow soldering processes, eliminating the need for separate wave soldering steps.   This technique is increasingly used in high-reliability applications where signal integrity, mechanical stability, and production efficiency are critical.     How THR Works   In the THR assembly: Components with specially designed through-hole pins are inserted into plated-through holes filled with solder paste. During reflow soldering, the paste melts and solidifies, anchoring the leads firmly into the PCB. No wave soldering is required, enabling full SMT-compatible production lines. This approach bridges the gap between high mechanical stress requirements and efficient automated production.     Key Advantages of THR in RJ45 Connectors   1. Enhanced Mechanical Strength RJ45 connectors often endure cable insertion/extraction forces. THR provides superior anchoring compared to SMT-only solutions. 2. SMT Line Compatibility THR parts can go through reflow soldering, allowing RJ45 connectors and SMT components to be assembled in a single pass. 3. Improved Reliability in Harsh Environments Ideal for industrial, telecom, or automotive Ethernet applications where vibration or shock may dislodge weaker joints. 4. Reduced Process Complexity By removing the wave soldering stage, THR simplifies the manufacturing process, especially for mixed-technology boards.       Design Guidelines for THR-Compatible RJ45 Connectors   To maximize THR benefits, engineers should consider: Solder Paste Volume Control: Ensure the correct solder volume is deposited into the PTH (Plated Through Holes). Thermal Profile Optimization: Adjust reflow profiles to ensure complete solder joint formation without voids. Pin Design: Use connectors with long, narrow, solderable leads designed to retain solder paste (e.g., eye-of-the-needle pins). PCB Pad Layout: Maintain proper annular ring dimensions and paste mask openings following IPC standards.     LINK-PP THR RJ45 Example: LPJG0926HENLS4R   One exemplary THR solution is the LPJG0926HENLS4R by LINK-PP. This integrated RJ45 connector is specifically designed for Through-Hole Reflow processes and offers: Integrated magnetics for 10/100/1000Base-T Ethernet Robust plastic housing with reinforced THR leads Minimum 350μH OCL at 8mA, ensuring signal integrity RoHS-compliant and halogen-free Fully compatible with SMT reflow ovens LPJG0926HENLS4R.pdf   This product is ideal for high-volume, mechanically demanding Ethernet applications, such as managed switches, routers, PoE devices, and embedded network modules.   THR vs SMT vs THT: Quick Comparison   Feature THT SMT THR Mechanical Strength ★★★★☆ ★☆☆☆☆ ★★★★☆ Assembly Method Wave solder Reflow solder Reflow solder Automation Limited Fully automated Fully automated Ideal for Ruggedized designs Compact PCBs Ruggedized SMT lines Example LPJ0188CNL LPJ19325AHNL LPJG0926HENLS4R     Applications Suited for THR-Mounted RJ45 Connectors   Industrial Ethernet Controllers Automotive Infotainment Systems Smart Grid & Energy Metering Medical Device Networks 5G Baseband and Radio Units     Final Thoughts   As PCB designs become denser while performance and durability demands rise, THR technology stands out as a modern, reliable, and efficient solution. For engineers designing with Ethernet connectivity in mind, using THR-compatible RJ45 connectors like LINK-PP’s LPJG0926HENLS4R offers a way to meet both mechanical and manufacturing goals without compromise.   To explore LINK-PP’s full range of RJ45 solutions, including THT, SMT, and THR options, visit www.rj45-modularjack.com.

Why RJ45 Connectors Have LEDs   RJ45 connectors with integrated LEDs are common in Ethernet ports across routers, switches, industrial controllers, and embedded systems. These LEDs, driven by the Ethernet PHY, provide quick visual feedback for: Link Status – Indicates a valid physical connection has been established. Data Activity – Blinks when packets are being transmitted or received. Connection Speed – Some PHYs assign colors to reflect 10/100/1000 Mbps link speed. ⚠ Note: Behavior is highly dependent on PHY configuration and may vary by design. Always consult the PHY datasheet for specific LED control logic.     Typical LED Behavior Reference   LED State Common Interpretation Solid Green Link at 100 Mbps (typical) Blinking Yellow Data activity present Solid Orange Often used to denote 1 Gbps Off No link or power issue     Custom LED Configurations with LINK-PP   LINK-PP supports full LED customization, including: Color combinations (e.g., Green/Yellow, Orange/Green, or bi-color LEDs) Positioning (left, right) Brightness level, logic polarity, and LED drive compatibility with PHY LED-free variants for ultra-compact or shielded applications Example: Industrial-grade connectors may use Orange/Green to clearly distinguish 100 Mbps and 1 Gbps links in high-noise environments. Custom codes like E-G/Y, W-G/G, Bi-color, or N/N (no LED) are embedded in the part number suffix for quick identification. (e.g., LPJG0933HENL = Green/Yellow LED combo)     Engineering Considerations   For optimal hardware integration, ensure: LED current ratings match PHY driver capabilities (typically 2–16 mA sink) Color selection aligns with user expectations and product UI Orientation of light pipes matches faceplate cutouts EMI concerns are addressed, especially for high-speed (1G/2.5G) Ethernet lines Environmental specs meet rugged/industrial standards if applicable     Why Use LED-Integrated RJ45s   Benefit Description Quick Troubleshooting LED indicators simplify link and activity diagnostics Reduced BOM No need for external LEDs and routing Better Aesthetics Clean integration with product design Customization Match your application’s logic and visual needs     Conclusion   Integrated LEDs are more than cosmetic—they are essential for visibility, diagnostics, and efficient deployment. With LINK-PP’s flexible customization, you can define the LED behavior, color, and positioning to match your system’s requirements precisely.   ☛ [Contact US for Custom RJ45 Design] ☛ [Explore LED RJ45 Products Catalog]

Introduction: A Crucial Choice in Ethernet Design RJ45 connectors are fundamental components in Ethernet systems, but engineers often face a design-level decision: Should you use an Integrated RJ45 (MagJack) or a Modular RJ45 (without discrete magnetics)?   This article, tailored for engineers, product designers, and EMS professionals, dives deep into the trade-offs between these two connector architectures—helping you make an informed decision for performance, cost, and manufacturability.     What Is an Integrated RJ45 (MagJack)?   An Integrated RJ45 combines: Standard RJ45 interface Built-in magnetics (isolation transformers, common-mode chokes) Optional LEDs   Advantages: Simplified layout — fewer external parts on the PCB Smaller footprint — ideal for compact designs Faster assembly — reduces BOM count Pre-qualified EMI performance   Drawbacks:  Limited tuning flexibility  Harder to service — the entire module needs replacing  Higher cost in low-volume production     What Is a Modular RJ45 (Empty Jack)? A Modular RJ45 provides just the jack. The magnetics are mounted separately as discrete components.   Advantages:  High customization — fine-tune magnetic specs  Easier maintenance — replace parts independently  Cost-effective for volume production   Drawbacks:  Larger PCB area required  More complex routing  Requires signal integrity expertise     Feature Comparison Table Integrated vs. Modular RJ45 Connectors Feature Integrated RJ45 Modular RJ45 Magnetics Built-in External PCB Complexity Low High Layout Flexibility Limited High EMI/SI Tuning Pre-set Customizable Assembly Simplified More steps Servicing Replace full module Replace part Cost (Low Volume) Higher Lower Cost (High Volume) Competitive Potentially cheaper     Design Application Guide   Choose Integrated RJ45 when: You need rapid prototyping or fast time-to-market Space is constrained (e.g., IoT boards, routers) You prefer plug-and-play EMI compliance   Choose Modular RJ45 when: EMI tuning is critical (e.g., medical, industrial) You build for high-volume production Your team has signal integrity design capabilities   Conclusion: Balance Flexibility with Simplicity The choice between integrated and modular RJ45 designs isn't just about price—it's about control, complexity, and context. At RJ45-ModularJack.com, we help OEMs and engineers select the best-fit solution from a full range of MagJack and discrete RJ45 options. Whether you're building a compact IoT device or a carrier-grade switch, we support your Ethernet interface design from concept to production.